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chmod

chmod - change file mode (permissions)

Synopsis

chmod mode file... 
chmod [augo][+-=][rwx]	file...

Description

The mode of each named file is changed according to mode, which may be an octal number or a symbolic change to the existing mode. A mode is an octal number constructed from the OR of the following modes.

0400	read by owner
0200	write by owner
0100	execute (search in directory) by owner
0070	read, write, execute (search) by group
0007	read, write, execute (search) by others

A symbolic mode has the form:

[who] op permission

The who part is a combination of the letters u (for user's permissions), g (group) and o (other). The letter a stands for ugo. If who is omitted, the default is a.

Op can be + to add permission to the file's mode, - to take away permission, and = to assign permission absolutely (all other bits will be reset).

Permission is any combination of the letters r (read), w (write), and x (execute).

See Also

ls and stat

Notes

See stat for interpretation of permissions on Windows-hosted systems.

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